19772821031 has 2 divisors, whose sum is σ = 19772821032. Its totient is φ = 19772821030.

The previous prime is 19772821009. The next prime is 19772821043. The reversal of 19772821031 is 13012827791.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19772821031 - 2²² = 19768626727 is a prime.

It is a super-2 number, since 2×19772821031² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19772821031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19772821001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9886410515 + 9886410516.

It is an arithmetic number, because the mean of its divisors is an integer number (9886410516).

Almost surely, 2^19772821031 is an apocalyptic number.

19772821031 is a deficient number, since it is larger than the sum of its proper divisors (1).

19772821031 is an equidigital number, since it uses as much as digits as its factorization.

19772821031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 41.

The spelling of 19772821031 in words is "nineteen billion, seven hundred seventy-two million, eight hundred twenty-one thousand, thirty-one".